IBAN format · MU

Mauritius IBAN format: 30 characters.

Mauritius IBANs have 30 characters: the country code MU, two check digits and a 26-character BBAN, the national account number, laid out as 4!a2!n2!n12!n3!n3!a.

Mauritius IBAN structure

MU17BOMM0101101030300200000MUR

Country code: MU
Check digits: 17
Bank code: BOMM01
Branch code: 01
Account: 101030300200000
Currency code: MUR

Parts of a Mauritius IBAN and their positions
Positions	Part	In the example
1–2	Country code	MU
3–4	Check digits	17
5–10	Bank code	BOMM01
11–12	Branch code	01
13–27	Account	101030300200000
28–30	Currency code	MUR

The BBAN, segment by segment

The registry writes the BBAN in SWIFT notation: n is a digit, a an upper-case letter, c a letter or digit, and the ! means a fixed length. 4!a2!n2!n12!n3!n3!a reads:

The Mauritius BBAN format, segment by segment
Positions	Notation	Holds	Example
5–8	4!a	4 upper-case lettersBank code	BOMM
9–10	2!n	2 digitsBank code	01
11–12	2!n	2 digitsBranch code	01
13–24	12!n	12 digits	101030300200
25–27	3!n	3 digits	000
28–30	3!a	3 upper-case letters	MUR

Mauritius IBAN example

MU17 BOMM 0101 1010 3030 0200 000M UR is the sample the SWIFT IBAN Registry publishes for Mauritius: a well-formed IBAN for showing the format, not a real account. Written electronically it has no spaces (MU17BOMM0101101030300200000MUR); on paper it is printed in groups of four.

Its check digits, worked through with ISO 7064 mod 97-10:

Move the country code and check digits to the end
BOMM0101101030300200000MURMU17
Replace each letter with two digits (A = 10 … Z = 35)
B = 11, O = 24, M = 22, U = 30, R = 27
112422220101101030300200000223027223017
Divide that number by 97 and keep the remainder
Remainder 1. A valid IBAN always leaves 1, so the check digits are right.
Where the check digits come from
Put 00 in their place (MU00…), repeat steps 1–3: remainder 81. The check digits are 98 − 81 = 17.

SEPA

Mauritius is not in the Single Euro Payments Area, so SEPA credit transfers and direct debits don’t reach MU IBANs.

What the format can and can’t tell you

Valid means the structure and check digits are right — not that the account exists or can receive payments.
National check digits inside the BBAN (e.g. the French RIB key, or the Spanish, Belgian and Italian CIN digits) are not verified.
Bank and branch codes are read from their positions; they are not looked up in a bank directory.

Check MU IBANs from code or an AI agent

REST · GET · no key

curl -s 'https://payopskit.com/api/v1/iban/MU17BOMM0101101030300200000MUR'

MCP · tools/call · validate_iban

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "validate_iban",
    "arguments": {
      "iban": "MU17BOMM0101101030300200000MUR"
    }
  }
}

Response (JSON)

{
  "input": "MU17BOMM0101101030300200000MUR",
  "iban": "MU17BOMM0101101030300200000MUR",
  "print": "MU17 BOMM 0101 1010 3030 0200 000M UR",
  "valid": true,
  "country": {
    "code": "MU",
    "name": "Mauritius",
    "sepa": false,
    "sepaNote": null
  },
  "checkDigits": "17",
  "expectedCheckDigits": "17",
  "length": {
    "actual": 30,
    "expected": 30
  },
  "bban": "BOMM0101101030300200000MUR",
  "bbanFormat": "4!a2!n2!n12!n3!n3!a",
  "bankCode": "BOMM01",
  "branchCode": "01",
  "parts": [
    {
      "label": "Country code",
      "value": "MU",
      "start": 0,
      "end": 2,
      "kind": "country"
    },
    {
      "label": "Check digits",
      "value": "17",
      "start": 2,
      "end": 4,
      "kind": "check"
    },
    {
      "label": "Bank code",
      "value": "BOMM01",
      "start": 4,
      "end": 10,
      "kind": "bank"
    },
    {
      "label": "Branch code",
      "value": "01",
      "start": 10,
      "end": 12,
      "kind": "branch"
    },
    {
      "label": "Account",
      "value": "101030300200000",
      "start": 12,
      "end": 27,
      "kind": "account"
    },
    {
      "label": "Currency code",
      "value": "MUR",
      "start": 27,
      "end": 30,
      "kind": "currency"
    }
  ],
  "checks": {
    "characters": true,
    "country": true,
    "length": true,
    "bbanFormat": true,
    "checksum": true
  },
  "errors": [],
  "notes": [
    "Valid means the structure and check digits are right — not that the account exists or can receive payments.",
    "National check digits inside the BBAN (e.g. the French RIB key, or the Spanish, Belgian and Italian CIN digits) are not verified."
  ]
}

The MCP server is at /mcp (Streamable HTTP, no key); the API and MCP docs show how to connect Claude, Cursor or VS Code.

From a national account number: GET /api/v1/iban/check-digits?country=MU&bban=… or the MCP tool compute_iban_check_digits computes the check digits and the whole IBAN.

Other 30-character IBANs

The same length doesn’t mean the same structure: compare the BBAN formats. All IBAN formats and lengths

Source: the SWIFT IBAN Registry (ISO 13616), transcribed and checked against each country’s registry example; the positions of bank and branch codes are given only where the registry’s are well established. The SWIFT IBAN Registry is the authority. Informational only.